package util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class factory {
//      要设置成全局变量，否则函数getFactory无法返回sqlSessionFactory
    static SqlSessionFactory sqlSessionFactory = null;

//    静态代码块会随着类的加载而自动执行，且只执行一次
    static{
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
//          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 变成全局变量
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static SqlSessionFactory getFactory()
    {
        return sqlSessionFactory;
    }
}
